Sanborn Fire Insurance Maps (Search for Towns in Pennsylvania, via Penn State University) – “The Sanborn Map Company, the best known of the US fire-insurance map producers, has made maps since 1867. The fire insurance maps produced by Sanborn show building footprints, building material, height or number of stories, building use, lot lines, road widths and water facilities. The maps also show street names and property boundaries of the time. This collection of maps is historically significant as it is sometimes the best detailed map of a town or city dating from the mid-1800s.”
Warrantee Township Maps – The Pennsylvania State Archives holds warrantee township maps, which show all original land purchases from the Proprietors of the Commonwealth made inside the boundaries of present-day townships. In essence, these maps serve as a summary and geographical index for the warrants, surveys and patents held by the State Archives.